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Don't flail, diagnose.If you fail it could be expensive -as in Thousands of $.
1.Get an electronic Engine Ear to locate the exact location of the tapping
2.Pull the plug lead from the cylinder that taps - what happens to the noise ? Yes you'll get a code.Do not run more than a few minutes w/o the plug connected.
3.drop the pan,cut open the filter - inspect for FOM.Post photos of separated debris if any here.
4,How many miles/ what service history/use/abuse ?
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